Critical severity · published May 29, 2026
CVE-2026-46376
FreePBX: Unauthenticated Use of Hard-Coded Credentials Vulnerability in FreePBX UCP Interface
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
FreePBX is an open source IP PBX. From 15.0.42 to before 16.0.45 and 17.0.7, unauthenticated users may be able to access the User Control Panel (UCP) using hard-coded initial template credentials if these were not immediately changed by the Administrator who enabled UCP. Authenticated access to ACP is required for the initial setup of UCP generic templates, but after that, without further steps by the admin, unauthenticated users may be able to gain access. This vulnerability is fixed in 16.0.45 and 17.0.7.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-reporting · FreePBX
>= 15.0.42, < 16.0.45; >= 17.0.1, < 17.0.7 · source: vendor
FR
Freepbx · Sangoma
before 16.0.45; 17.0 before 17.0.7 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46376
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-46376
x_refsource_CONFIRM
https://github.com/FreePBX/security-reporting/security/advisories/GHSA-m55x-h47x-v3gx
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